Malicious PDF — malware analysis report

Static analysis result for SHA-256 d878b64a70b9c1cc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 15:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5c24ca87a328b859096797009059df59 SHA-1: ddfc23a8378bb8f5f6f0c6c3bba6c9fe812351c3 SHA-256: d878b64a70b9c1cc64c1fc1f39e210a23ae249aa4646f4d2663f7756da76514c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. Heuristics indicate these links are used to host other PDFs or direct users to potentially malicious content, aligning with a phishing or malware distribution attack pattern. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rowadhr.com/app/webroot/upload/files/15955993105.pdf In PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/55382551769.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/98329576892.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/483047727.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/83463382508.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/3532571855.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vamokudunezipij.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b8a97783e9e7196f7eca7a51bc3dd704/pedutewofijevosumo.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/xokobikizivizusesu.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/98826223795.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/ridawilutaxer.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e796ecce4---wafawojarin.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dd94a254191973ad688fca83e69f9354/95467667031.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/wimexodatozosipotuwemew.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/79670067272.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/febofaxadekitasu.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zasalusonotofeloxaripu.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/77883160887.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/40632343930.pdfIn PDF document text
    • https://medtek.vn/storage/file/muvovobozakalevaj.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/13138924084.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/xasikugese.pdfIn PDF document text
    • http://potlista.com/file/files/68097955156.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomenukiwokevusipazunafow.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/79218908814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=8+ball+pool+hack+android+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 10852 bytes
SHA-256: 830f0d00fdf5a450de309d629c08b0a0f60e9a3657cd9c63477beb985feb821b
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 17212 bytes
SHA-256: c97e830c67e0a6bb000e764861013cb44317a2e49eb3490f38f365aebdd09c0c
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1